Create painted wood with grain
I usually start with a Wave Texture set to ring. Since the door is made from many parts, it should be uv unwrapped to reflect that, or copies of the material made per board so the grains can be different. The position of the ring, and scale, is set using the mapping node, and the output fed to a color ramp, which feeds roughness in the principled BSDF. The original ring output can also be used to control a second noise texture to add the lines.